#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main()
{
ll n,m,k;cin>>n>>m>>k;
map<ll,bool>vis;
while(m--){
ll x;cin>>x;
for(ll i=x-k;i<=x+k;i++)vis[i]=1;
}
ll ans=0;
for(ll i=1;i<=n;i++){
if(!vis[i]){
for(ll j=i+k;j>=i;j--)vis[j]=1;
for(ll j=i+k;j<=i+k*2;j++)vis[j]=1;
ans++;
}
}
cout<<ans<<endl;
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
204 KB |
Output is correct |
2 |
Correct |
0 ms |
204 KB |
Output is correct |
3 |
Correct |
1 ms |
332 KB |
Output is correct |
4 |
Correct |
1 ms |
332 KB |
Output is correct |
5 |
Correct |
1 ms |
332 KB |
Output is correct |
6 |
Correct |
1 ms |
332 KB |
Output is correct |
7 |
Correct |
1 ms |
332 KB |
Output is correct |
8 |
Correct |
1 ms |
332 KB |
Output is correct |
9 |
Correct |
2 ms |
332 KB |
Output is correct |
10 |
Correct |
1 ms |
332 KB |
Output is correct |